package com.itheima.reggie.controller;

import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.UUID;

/**
 * 文件上传与下载
 */
@RestController
@RequestMapping("/common")
@Slf4j
public class CommonController {
    @Value("${reggie.path}")
    private String basePath;
    /**
     * 文件上传
     * @param file
     * @return
     */
    @PostMapping("/upload")
    public R<String> upload(MultipartFile file) throws IOException {
        File dir = new File(basePath);
//        判断是否存在
        if(!dir.exists()){
//            不存在创建
            dir.mkdirs();
        }
        String s = UUID.randomUUID().toString();
//        截取文件后缀
        String suffix = file.getOriginalFilename().substring(file.getOriginalFilename().lastIndexOf("."));
//        将临时文件转存到指定位置
//        System.out.println(basePath+s+suffix);
        file.transferTo(new File(basePath+s+suffix));
        return R.success(s+suffix);
    }

    /**
     * 文件下载
     * @param name
     */
    @GetMapping("/download")
    public void download(String name, HttpServletResponse resp){
        try {
            //输入流，通过输入流读取文件内容
            FileInputStream fi = new FileInputStream(new File(basePath + name));
            //输出流，通过输出流将文件写回浏览器，在浏览器展示图片了
            ServletOutputStream os = resp.getOutputStream();
            resp.setContentType("image/jepg");
            int len=0;
            byte[] bytes = new byte[1024];
            while ((len=fi.read(bytes))!=-1){
                os.write(bytes,0,len);
                os.flush();
            }
            os.close();
            fi.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }


    }
}
